b'\x1b\x1a\x19 \x1f\x18\x1d\x17\x16Machinists Cornerin a loop that repeats a cut-and- Then the program moves incremen-retract cycle. tally in the Z dimension by adding Program flow. The program feeds#2 to the previous value of #1. The to the beginning of the loop, N40.program next feeds to the new #1 Z B. TaylorAt top is a chip produced without using the peck technique. Below that are peck-produced chips.dimension. When the tool reaches Z #1, the tool retracts at 45 from the work in N70, then moves back to the work behind Z #1 in N80. The pro-gram now returns to WHILE. If the 10,335,870 WHILE condition is true, the process repeats. If WHILE is false, the pro-gram goes to END1. Then blocks N90 and N100 clean the end of the cut. N110 retracts the tool, and the program can go on from there. Since the feed rate equals #2, one chip will be broken per revolution. With the 25 mm (0.98") cut dia., the chip length will be about 75 mm (2.95").Heres a tip for using this type of process. When cutting metal on a lathe, the metal is compressed as it is cut, so chip length will be less than the length of the cut. A heavier cut means more compression and a shorter chip.20JULY 2020MachinistsCorner.indd 20 6/16/20 9:17 PM'